1. Which is the hottest zone and the coolest zone of a flame ?
2. Why does the middle zone of the candle flame glow with yellow colour ?

1. The innermost or dark zone has a minimum temperature. The outermost or non-luminous zone has a maximum temperature.
2. In the middle zone, the unburnt carbon particles give the flame its yellow colour.

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Updated on: 16-Mar-2023

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